Merged revisions 87188-87190,87192-87194 via svnmerge from

Merged revisions 87188-87190,87192-87194 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r87188 | antoine.pitrou | 2010-12-12 19:25:25 +0100 (dim., 12 déc. 2010) | 3 lines

  Make this a warning and fix indentation
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  r87189 | antoine.pitrou | 2010-12-12 20:59:47 +0100 (dim., 12 déc. 2010) | 3 lines

  Better explain the buffer interface (hopefully)
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  r87190 | antoine.pitrou | 2010-12-12 21:01:43 +0100 (dim., 12 déc. 2010) | 3 lines

  Add link to the buffer protocol description from the memory description.
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  r87192 | antoine.pitrou | 2010-12-12 21:09:18 +0100 (dim., 12 déc. 2010) | 3 lines

  Remove redundant sentence, and fix markup
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  r87193 | antoine.pitrou | 2010-12-12 21:13:31 +0100 (dim., 12 déc. 2010) | 3 lines

  Fix heading level
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  r87194 | antoine.pitrou | 2010-12-12 21:17:29 +0100 (dim., 12 déc. 2010) | 3 lines

  Consistent ordering of availability statements
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